How to Create a RESTful API in PHP With SlimPHP 4 and MySQL

In this tutorial, you will learn how to create a RESTful API using Slim 4, PHP, and MySQL. The prerequisites for this tutorial include having PHP version 7.4 (ideally 8.1), Composer installed globally, and MySQL 8. You will also need Postman to test the API. To begin, create a project directory named customers-api and two subdirectories: src and public. Inside the src directory, create another directory called Models with a file named Db.php. The public directory should contain an index.php file. Next, install the required dependencies using Composer by running the command `composer require --with-all-dependencies \ slim/slim:"4.*" \ slim/psr7 \ selective/basepath`. Then, provision the database schema with the necessary tables and dummy records using MySQL. Create a Slim application in public/index.php by instantiating the app and attaching middleware classes to it. To check that the application works, start it running using PHP's built-in web server on port 8888. To create the database connection, add a PSR-4 autoloader in composer.json and regenerate Composer's autoloader. Then, update the values for $host, $user, $pass, and $dbname to match those in your database in the src/Models/Db.php file. Create routes for HTTP requests by adding appropriate code to public/index.php. Test each route using Postman or a web browser. Finally, create a DELETE request to delete an entry from the customers table and confirm that it has been removed. By following these steps, you will have successfully created a RESTful API using Slim 4, PHP, and MySQL.